SFC follows the same pattern of mobo revisions as US SNES, more or less. 1-chip model will also report chip revisions as 2,1,3, so only way to know your mobo revision is to open your console and check.
Some are known to cause more problems than others, eg the APU variety.
For the horizontal bar, sounds like a power issue. Trying a different AC adapter is a good idea. It’s possible you’d need to replace some caps or add more bypass capacitor to the power line. Cap kits can be bought from console5.
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